Jira does not prevent you from doing this. You admin(s) must be diligent and not create this issue as it will become challenging to mange to be sure. You need to either get rid of one of them or rename one of them. If you choose to combine the two then I would recommend you first rename one as that will make it easier to combine.
no idea why this would occur. What field/fields are being duplicated? Here are my current theories:
I would suggest the following course of action.
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